"We are proud to have this exceptionally handsome Phantom I with a glittering Hollywood history. This magnificent roadster, with rumble seat, is sure to be the star of any significant event," said Chris Routledge, the managing director of Coys, prior to the auction.

The 120-vehicle auction, which took place at Winston Churchill's ancestral home, also saw a left-hand drive 1958 Mercedes-Benz 300 SL Roadster make 400,000, while a 1969 Jaguar E-Type Series II 4.2 Roadster sold for 28,000.

A number of miniature cars also featured. A 1957 Brutsch Mopetta made 32,000, while a Peel Trident achieved 30,000.

The HAGI Top 50 Index, the Historic Auto Group's price index of leading classic cars, grew by 4.49% last month and is up 10.33% since the beginning of the year.